Two quit over Buswell crash inquiry

Two Liberal members of a West Australian parliamentary committee have resigned following fierce criticism of an inquiry into the car crashes of fallen treasurer Troy Buswell.

Ian Britza and Chris Hatton resigned on Tuesday from the Community Development and Justice Standing Committee, but three Labor members remain part of the committee.

The pair had rejected the majority report of the committee, which criticised the police investigation into the ministerial car crashes, and issued their own individual reports.

Mr Buswell quit cabinet following revelations he had a mental breakdown after crashing into parked cars, a pole and the front gate of his Subiaco home while returning from a wedding in the early hours of February 23.

Police Commissioner Karl O'Callaghan and Police Minister Liza Harvey said last week that the majority report - written by Margaret Quirk, Tony Buti and Mick Murray - lacked objectivity and should be disregarded.

Mr O'Callaghan said the report manipulated evidence and tried to push a conspiracy theory about authorities going easy on the investigation.

The commissioner said he had never been involved in a committee inquiry that had been so biased and geared towards a pre-determined outcome.